Ok club members, the new GPU-Z 0.5.8 has now a ASIC
quality rating designed for NVIDIA Fermi based GPU's on the electrical leakages the chips produce (to increase yield by allotting them in different SKUs and performance bins), where the quality can be quantified and displayed.
Open up GPU-Z and right click the upper left hand corner on the GPU-Z icon. On the drop down box you will notice the 'ASIC' option.
It will display the ASIC quality of your chip that handles voltage electrical leakage the chips produce. The higher percentage the less voltage leakage. It's a new reading. From what results I've seen though still doesn't mean lower ASIC quality means less over clock ability and vice versa.
Here's my screen shot: of mine showing ASCI 86.9%
which is darn pretty good. Highest clock through 3DMark11 and BF3 game play reached 950Mhz (see first page for 'proof') at 74C highest temp.
Didn't know if anyone else spotted this and thought I'd bring the attention to club members. Hasn't been confirmed that higher ASIC allows for higher over clocks.